[JackSlateur]

Hydrogen is a bad idea because it is dangerous (highly explosive) and also leaky, due to the size of the atom

To transport hydrogen, you need complex infrastructure (real cold trunk or whatever) and you still leak, so the overall efficiency is bad

[leonidasrup]

The Flammable Range (also called Explosive Range), the concentration range of a gas or vapor that will burn (or explode) if an ignition source is introduced, for hydrogen is much larger then for methane.

https://www.engineeringtoolbox.com/explosive-concentration-l...

Becuse of hydrogen embrittlement you have to be carefull with material selection for pipes, storage tanks holding hydrogen. This not a big problem, but it means old pipes used for natural gas can not be used for hydrogen.

https://en.wikipedia.org/wiki/Hydrogen_embrittlement

[FinnKuhn]

https://www.bundesnetzagentur.de/EN/Areas/Energy/HydrogenCor...

Germany is planing a hydrogen pipeline network.